Based on the 1930 novel of the same name by Agatha Christie. The action of the play passes in the study of a vicarage in the country, at the present time. When the Parson declares rather carelessly ‘Anyone who murdered Colonel Prothero would be doing the world at large a service !’, he does not realise his words will come back to haunt him. From several potential murderers, Miss Marple must find the real killer.